mirror of
https://github.com/RGBCube/serenity
synced 2025-05-31 08:18:11 +00:00
cf271183b4
This has several benefits: 1) We no longer just blindly derefence a null pointer in various places 2) We will get nicer runtime error messages if the current process does turn out to be null in the call location 3) GCC no longer complains about possible nullptr dereferences when compiling without KUBSAN
120 lines
2.8 KiB
C++
120 lines
2.8 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Singleton.h>
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#include <Kernel/Debug.h>
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#include <Kernel/FileSystem/DevPtsFS.h>
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#include <Kernel/Process.h>
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#include <Kernel/TTY/MasterPTY.h>
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#include <Kernel/TTY/SlavePTY.h>
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namespace Kernel {
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static Singleton<SpinLockProtectedValue<SlavePTY::List>> s_all_instances;
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SpinLockProtectedValue<SlavePTY::List>& SlavePTY::all_instances()
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{
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return s_all_instances;
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}
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bool SlavePTY::unref() const
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{
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bool did_hit_zero = SlavePTY::all_instances().with([&](auto&) {
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if (deref_base())
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return false;
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m_list_node.remove();
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return true;
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});
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if (did_hit_zero)
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delete this;
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return did_hit_zero;
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}
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SlavePTY::SlavePTY(MasterPTY& master, unsigned index)
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: TTY(201, index)
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, m_master(master)
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, m_index(index)
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{
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m_tty_name = String::formatted("/dev/pts/{}", m_index);
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auto& process = Process::current();
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set_uid(process.uid());
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set_gid(process.gid());
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set_size(80, 25);
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SlavePTY::all_instances().with([&](auto& list) { list.append(*this); });
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}
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SlavePTY::~SlavePTY()
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{
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dbgln_if(SLAVEPTY_DEBUG, "~SlavePTY({})", m_index);
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}
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String const& SlavePTY::tty_name() const
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{
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return m_tty_name;
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}
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void SlavePTY::echo(u8 ch)
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{
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if (should_echo_input()) {
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auto buffer = UserOrKernelBuffer::for_kernel_buffer(&ch);
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[[maybe_unused]] auto result = m_master->on_slave_write(buffer, 1);
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}
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}
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void SlavePTY::on_master_write(const UserOrKernelBuffer& buffer, size_t size)
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{
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auto result = buffer.read_buffered<128>(size, [&](u8 const* data, size_t data_size) {
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for (size_t i = 0; i < data_size; ++i)
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emit(data[i], false);
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return data_size;
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});
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if (!result.is_error())
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evaluate_block_conditions();
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}
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KResultOr<size_t> SlavePTY::on_tty_write(const UserOrKernelBuffer& data, size_t size)
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{
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m_time_of_last_write = kgettimeofday().to_truncated_seconds();
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return m_master->on_slave_write(data, size);
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}
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bool SlavePTY::can_write(const FileDescription&, size_t) const
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{
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return m_master->can_write_from_slave();
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}
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bool SlavePTY::can_read(const FileDescription& description, size_t offset) const
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{
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if (m_master->is_closed())
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return true;
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return TTY::can_read(description, offset);
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}
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KResultOr<size_t> SlavePTY::read(FileDescription& description, u64 offset, UserOrKernelBuffer& buffer, size_t size)
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{
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if (m_master->is_closed())
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return 0;
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return TTY::read(description, offset, buffer, size);
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}
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KResult SlavePTY::close()
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{
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m_master->notify_slave_closed({});
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return KSuccess;
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}
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String SlavePTY::device_name() const
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{
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return String::formatted("{}", minor());
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}
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FileBlockCondition& SlavePTY::block_condition()
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{
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return m_master->block_condition();
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}
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}
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